130 lines
4.3 KiB
Python
130 lines
4.3 KiB
Python
import mimetypes
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from django.conf import settings
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from django.db import models as dbmodels
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from PyPDF2 import PdfFileReader
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from PyPDF2.utils import PdfReadError
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from ..utils.auth import get_group_model
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from ..utils.rest_api import (
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FileField,
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IdPrimaryKeyRelatedField,
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ModelSerializer,
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SerializerMethodField,
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ValidationError,
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)
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from .models import Mediafile
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class AngularCompatibleFileField(FileField):
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def to_internal_value(self, data):
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if data == "":
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return None
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return super(AngularCompatibleFileField, self).to_internal_value(data)
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def to_representation(self, value):
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if value is None or value.name is None:
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return None
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filetype = mimetypes.guess_type(value.name)[0]
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result = {"name": value.name, "type": filetype}
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if filetype == "application/pdf":
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try:
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if (
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settings.DEFAULT_FILE_STORAGE
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== "storages.backends.sftpstorage.SFTPStorage"
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):
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remote_path = value.storage._remote_path(value.name)
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file_handle = value.storage.sftp.open(remote_path, mode="rb")
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else:
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file_handle = open(value.path, "rb")
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result["pages"] = PdfFileReader(file_handle).getNumPages()
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except FileNotFoundError:
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# File was deleted from server. Set 'pages' to 0.
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result["pages"] = 0
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except PdfReadError:
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# File could be encrypted but not be detected by PyPDF.
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result["pages"] = 0
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result["encrypted"] = True
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return result
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class MediafileSerializer(ModelSerializer):
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"""
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Serializer for mediafile.models.Mediafile objects.
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"""
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media_url_prefix = SerializerMethodField()
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filesize = SerializerMethodField()
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access_groups = IdPrimaryKeyRelatedField(
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many=True, required=False, queryset=get_group_model().objects.all()
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)
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def __init__(self, *args, **kwargs):
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"""
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This constructor overwrites the FileField field serializer to return the file meta data in a way that the
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angualarjs upload module likes
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"""
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super(MediafileSerializer, self).__init__(*args, **kwargs)
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self.serializer_field_mapping[dbmodels.FileField] = AngularCompatibleFileField
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# Make some fields read-oinly for updates (not creation)
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if self.instance is not None:
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self.fields["mediafile"].read_only = True
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class Meta:
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model = Mediafile
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fields = (
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"id",
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"title",
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"mediafile",
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"media_url_prefix",
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"filesize",
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"access_groups",
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"create_timestamp",
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"is_directory",
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"path",
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"parent",
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"list_of_speakers_id",
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"inherited_access_groups_id",
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)
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read_only_fields = ("path",)
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def validate(self, data):
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title = data.get("title")
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if title is not None and not title:
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raise ValidationError({"detail": "The title must not be empty"})
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parent = data.get("parent")
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if parent and not parent.is_directory:
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raise ValidationError({"detail": "parent must be a directory."})
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if data.get("is_directory") and "/" in data.get("title", ""):
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raise ValidationError(
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{"detail": 'The name contains invalid characters: "/"'}
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)
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return super().validate(data)
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def create(self, validated_data):
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access_groups = validated_data.pop("access_groups", [])
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mediafile = super().create(validated_data)
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mediafile.access_groups.set(access_groups)
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mediafile.save()
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return mediafile
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def update(self, instance, validated_data):
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# remove is_directory, create_timestamp and parent from validated_data
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# to prevent updating them (mediafile is ensured in the constructor)
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validated_data.pop("is_directory", None)
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validated_data.pop("create_timestamp", None)
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validated_data.pop("parent", None)
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return super().update(instance, validated_data)
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def get_filesize(self, mediafile):
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return mediafile.get_filesize()
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def get_media_url_prefix(self, mediafile):
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return settings.MEDIA_URL
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